PC
World "A top-flight defragging program, Vopt is compatible with Vista and defrags system Restore Points. The program also has some nice exras, including tools to delete temp files and a slick feature that closes unnecessary apps, including Services."
--Steve Bass

SOFTOOGLE
"A
compact, fast, and easy-to-set-up defragmenter capable of working on a schedule.
It erases the various junk files (such as temp files); changes the size of the
swap file and cache; displays system processes, resources etc."